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          CGLIB代理和JDK代理
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        <h2 id="CGLIB"><a href="#CGLIB" class="headerlink" title="CGLIB"></a>CGLIB</h2><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// CGLIB动态代理</span></span><br><span class="line"><span class="comment">// 1. 首先实现一个MethodInterceptor，方法调用会被转发到该类的intercept()方法。</span></span><br><span class="line"><span class="keyword">class</span> <span class="title class_">MyMethodInterceptor</span> <span class="keyword">implements</span> <span class="title class_">MethodInterceptor</span>&#123;</span><br><span class="line">  ...</span><br><span class="line">	<span class="meta">@Override</span></span><br><span class="line">	<span class="keyword">public</span> Object <span class="title function_">intercept</span><span class="params">(Object obj, Method method, Object[] args, MethodProxy proxy)</span> <span class="keyword">throws</span> Throwable &#123;</span><br><span class="line">		logger.info(<span class="string">&quot;You said: &quot;</span> + Arrays.toString(args));</span><br><span class="line">		<span class="keyword">return</span> proxy.invokeSuper(obj, args);</span><br><span class="line">	&#125;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 2. 然后在需要使用HelloConcrete的时候，通过CGLIB动态代理获取代理对象。</span></span><br><span class="line"><span class="type">Enhancer</span> <span class="variable">enhancer</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">Enhancer</span>();</span><br><span class="line">enhancer.setSuperclass(HelloConcrete.class);</span><br><span class="line">enhancer.setCallback(<span class="keyword">new</span> <span class="title class_">MyMethodInterceptor</span>());</span><br><span class="line"></span><br><span class="line"><span class="type">HelloConcrete</span> <span class="variable">hello</span> <span class="operator">=</span> (HelloConcrete)enhancer.create();</span><br><span class="line">System.out.println(hello.sayHello(<span class="string">&quot;I love you!&quot;</span>));</span><br><span class="line"></span><br></pre></td></tr></table></figure>



<h2 id="优缺点比较"><a href="#优缺点比较" class="headerlink" title="优缺点比较"></a>优缺点比较</h2><p>JDK</p>
<ol>
<li><p>根据ClassLoader和Interface来获取接口类（前面已经讲了，类是由ClassLoader加载到JVM的，所以通过ClassLoader和Interface可以找到接口类）</p>
</li>
<li><p>获取构造对象；</p>
</li>
<li><p>通过构造对象和InvocationHandler生成实例，并返回，就是我们要的代理类。</p>
</li>
</ol>
<p>Java动态代理优缺点：</p>
<p>优点：</p>
<ol>
<li><p>Java本身支持，不用担心依赖问题，随着版本稳定升级；</p>
</li>
<li><p>代码实现简单；</p>
</li>
</ol>
<p>缺点：</p>
<ol>
<li><p>目标类必须实现某个接口，换言之，没有实现接口的类是不能生成代理对象的；</p>
</li>
<li><p>代理的方法必须都声明在接口中，否则，无法代理；</p>
</li>
<li><p>执行速度性能相对cglib较低；</p>
</li>
</ol>
<p>Cglib原理：</p>
<p>1.通过字节码增强技术动态的创建代理对象；</p>
<p>2.代理的是代理对象的引用；</p>
<p>Cglib优缺点：</p>
<p>优点：</p>
<p>1.代理的类无需实现接口；</p>
<p>2.执行速度相对JDK动态代理较高；</p>
<p>缺点：</p>
<p>1.字节码库需要进行更新以保证在新版java上能运行；</p>
<p>2.动态创建代理对象的代价相对JDK动态代理较高；</p>
<p>Tips：</p>
<p>1.代理的对象不能是final关键字修饰的</p>
<blockquote>
<p><a target="_blank" rel="noopener" href="https://www.cnblogs.com/carpenterlee/p/8241042.html">https://www.cnblogs.com/carpenterlee/p/8241042.html</a></p>
<p><a target="_blank" rel="noopener" href="https://www.cnblogs.com/brithToSpring/p/13356626.html">https://www.cnblogs.com/brithToSpring/p/13356626.html</a></p>
<p><a target="_blank" rel="noopener" href="https://segmentfault.com/a/1190000023514746">https://segmentfault.com/a/1190000023514746</a></p>
</blockquote>

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